落叶松树皮活性物质提取及红外光谱分析

采用一维红外光谱法并结合二阶导数红外光谱法以及二维相关光谱分析技术对超声波辅助提取的落叶松树皮活性物质进行了无损快速对比分析研究。发现落叶松树皮活性物质中的主要成分是(＋)-儿茶素、(-)-表儿茶素为结构单元，且以4-8位连接的二聚原花青素，没食子酸以及vitisinol为代表的一系列聚多酚化合物;二阶导数光谱中落叶松树皮原花青素在1 631, 1 517, 1 468 cm-1处吸收峰与原花青素标准品相比，向低波数位移，而1 200和1 062 cm-1处吸收峰则向高波数位移;并且在1 643，1 518，819，780，765 cm-1处的吸收峰越强，(+)-儿茶素含量越高;1 518, 1 469, 1 112, 796 cm-1处的峰强则可以代表(-)-表儿茶素的含量。二维相关红外谱显示落叶松树皮活性物质谱图对角线上出现5个自动峰：1 385, 1 449, 1 505, 1 532, 1 628 cm-1，以1 628 cm-1最强。成功地为深入研究落叶松树皮活性物质结构鉴定提供了一种新的方法。

Study on Extracts of Active Substances from Larch Bark by FTIR Spectroscopy

The present study is to compare and analyze extracts of active substances from larch bark using ultrasonic wave quickly and undamagedly via Fourier transform infrared spectroscopy,second derivative IR spectroscopy and two dimensional spectroscopy.In the spectra of active substances from larch bark,there are four main components as the structural unit,and(+)-catechin,(-)-epicatechin,gallic acid and vitisinol represented a series of poly polyphenolic compounds.Furthermore the linkage between unit in proanthocyanidins dimmers was confirmed at position C(4)-C(8).Through observing the second derivative IR spectra of active substances from larch bark,the absorption peaks,1 631,1 561 and 1 469 cm-1 of active substances moved to the smaller wave number direction,while 1 606,1 385,1 285 and 1 157 cm-1 of active substances moved to the bigger wave number direction,and the intensity of characteristic peaks can represent the content of corresponding compound.In the two dimensional spectra,the active substances from larch bark have five automatic peaks in 1 345~1 675 cm-1.The authors developed the new method to analyse and evaluate the active substances from larch bark successfully.